From 2016 to 2023, 84% of monitoring stations showed significant trend changes in MDA8O3 ( p < 0.05), with 80% exhibiting an increasing trend, although the magnitude varied spatially (see Table S1 ).
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Understanding ozone variability in spatial responses to emissions and meteorology in China using interpretable machine learning.
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The northern regions showed an increasing trend of 0–2 μg/m 3 a −1 , while the southern regions showed a decreasing trend of −2 to 0 μg/m 3 a −1 .